Evaporating process and apparatus



Oct. 23, 1923.

` R. E. WLSON EVAPORATING PROCESS AND APPARATUS Filed' July 18. 1922 INVENTOR.

?etentecl 63& 233,

;31, entre-e 4 A interes- L etnise,

IRQBEBT E mson, QE' CAMBBJIDGE, MASSCEUSETTL AQEATG' FBGCES AND MPMTUS i hppiicatiou me& nly 123,

Te whom it may mesem:

Be thnown that l, ROBERT WiLson,

citizen of the United States, resicling et Csmbridge, in the county of Middlesex and.

provide e, method and means for ;affecting e seperetion of e solid from its dispersion in e liquid, hy e, "convenient, cheap and highly ef'icient menner.

More specificslly it is en object of this invention to provide a process and epparetns {for recovering, in-finely divided form, solide, such es ecids, selts and heses froni solutions, suspensions, or emulsions, or other solid or substentially non-volatile meteriel dispersed in e liquid for example, the eveporsticn of milk to obtein dry, powdered mili&

This inve ntion lencls itself particularly well to the production of fine-ly divided, resdily soluble, solid ersenic seid from the moderately stron solution made by oxidizing fis t), with NO Ordinery evsporation processes ere very dicult' to Carry out on el ccbunt of the high temperetures required, the corrosion of metal vessels through which heet is being forced, and thehighly viscous or pasty character of' the solution just before it solidiies,` etc. Frthermore, ordinary processes yield large lumps of glssy solid material which are difiicult to pack and ship to prevent their absorbing moisture, and which go-into solution very slowly.

Reference'is to be had to the eccompeny ing drawing which illustretes, in diegremmetic form, an apparatus which is suitable for practicing this invention. This apperatus comprises anelongeted tower (1), the

lower. portion (2) of which is adpted to hold the liquid to be' evaporated. A circulatingpump (3) cdm'municates 'et one end with thelower portion (2) of the tower and at the other end is connected by the Conduit or pipe (4) to a suitable' spreyer (5) which projects upwardl within the tower (1); 6) is connected to an air ieee. semi ne. 57233955.

(8), 'for reguleting the'supply eir to the spreyer.`

A burner (9) is positioned within the tower (1) a small distance below the sprsiyer (5) and is connectedto e suitable source of gaseous or liquid :uel end air, the Supplies of which are reguleted by the velves, (10) i end (11) respectively. This type oi 'bornet' is used where eveporaton is to be cerried out by means of s, burning ritme. Hovw ever if lower temperatures used, for enemple, in the evaporetion of milk, the burner may be replaced by e suitable hot &ir distrbutor connected to e supply of heeted air.

ln carrying out the eveporetion, the liquid from the bottom (2) of the tower is rojected upwardly through the spreyer (5 by means of the crculatng pump (3). Th

burner is then lighted, and the flames project upwardly and through the path of the drops of liquid issuing from the spreyer, The iner drops of liquid are reedily'cerried along by the rising stream of hosted eir end eveporeted before they pess out et the top (12) of the tower; The larger drops, hevzi-` ever, either strike the sides oi the tower or fell to thebottom (2) where they are caught in the well of liquid which' is recirculeted by the pump (3). For the most eficient operetion of this, process, the' amount .of spmy should be so regulated that that whichrms ;down the sides of the tower will not solidify,

but will keep the base of the tower covered with e flowing film of liquid, thus preventing undesirable decomposition and et the same time utilizing most efiiciently the heat in the system, especially that radieted' by the burner. The finer drops which are/ear ried along with the hot geses are quickly eveporated, and the solid perticles resulting therefrom are very light and ere cerried along even morre rapidly by the upwerdly supply of air for comp ete combustion thereof.` As this partly hurned %tel mixes with the liquid issuin from the spreyer 5), the

air from the air e 7)', which hes ecome edmixed with the liqeni before it hes issud,

with air upwardly into the path of an ascending, partially-burned, heating fluid, eveporetin to dryness the fine drops issuing from t e spray and carrying'the evapo- I liquid, eyaporating to dryne'ss the fine d'ops issuin from the spray, carrying the eveporated ne solid perticles away by the ascending' hot geses and then seperating said solid ?articles from .the ases.

10. In a process of desiccating liquids carryingsolids, spreying said liquid upwerdly into the path of en ascending fiame, continuing the comhustion of the hoat producing medium' during contact of the fieme with the spray of liqiiid allowing the large drops of sprayed liquid to return to the main body of said liquid, evaporating to dryness the fine drops issuing from the sprey, cerr'ying the evaporated solid perticles away hy the ascending hot gases and then %pereting seid solid perticles from the gases) 11. in a process of making finely-divided, solulole, -arsenic seid, spraymg an equeous dispersion thereof upwardly in an internally heated shembet', evaporetingthe fine drops issuing from the sprey and carrying the eveporeted., fine, solid perticles ewey by the ascending hot gases and allowing the large drops of the sprayed liquid to return to the mam body of said liquid.

12. ?in e process of making finely-divided,

soluble', ersenio ecicl, spreying en equeous dispersion thereof upwardly into the path of an ascending tleme and continuing the combus'tion of the heet-producing medium during contact of the fieme with the spi-ay of liquid and evaporating the fine drops imuing from said sprey( 13. In e process of making' finely divided, soluble, ersenio seid, projecting e, fel burning with en insutiicient supply of air. into e V spara-y of en aqueous dispersion of arsenic ecid edmixed with suilicient air to complete the combustion of the fuel and evaporeting the fine drops issuing from said sprey.

14. In e process of makingfinely-divided, v

soluble ersenic seid, spreying en eq eous dsperson thereof upwardl into the path ..mitin ascending llama, contmuing the 'combastion of theheat-producing medium during contact of the`fleme with the sprey of liquid, allowing the lerge drops of spreyed liquid to return to the mein body of said liq'id, eveporeting to dryness the fine drops issning from the spray, carrying the evaporated, solid articles away by the ascending hot geses end then separating seid solid particles :from the geses.

1& An epparetus for recoverng solids i dispersed in -liq uids comprising e heating chember,` 'e sprayer within said chemher, a

'liquid circulatorcommunicating with seid sprayer and the lower part of said chamher and e heater within seid chamher in close proximity 'to and below said sprayer.

16. An epperatus for recovering solide dispersed in liquids comprising e heating chamber, a sproyer within said ehamher, e

a Ar liquid circuletor communiceting with seid spreyer and the lower part of said chamber and e burner within said chamber in close proximity to and below 'seid spreyei:

' 17., An epparetus for recovering solide dispersed in liq ids comprisiig e heating chemher, a spre er within said shembet', e liquid circulator communiceting with seid spreyer and the lower part of said chember; a burner within seid ehember in'close promimity to and below seid sproyer and means for delivering sir to seid spreyer.

18. An epperetus for recovering solide dispersed in liquids comprising e heating chember, a sprayer within seid chambem' e' liqiid circulator oommuniceting with seid' spmyer end the lower port of seid chemher, e hurner within seid ehemher'in close proir-` imity to and below said spreyer, means for delivering air to. seid sprsyer end means for regulating the supply of eir to seid bur-ner. I

19. An epperetus for reco zering solide dispersed in liquids comprising e heating chamber, a spi-&yer within seid chamber', e lqud crculator communcetmg with seid spreyer and the lower part of said Cham ber, e humor within seid chember in close proximity to end below seid sprayer, and means for separating the fine, evepomted solid psrticles from the other material essociated therewith.

- 20. An epparetus for recovering solide disperse'd in liqiids coinprising e hosting chamber, e. spreyer within seid chamher, e

liquid circuletor communicatingwith said spreyer and the lower part of seid shembet', a heater within seid chsmber in close pro&` imity to seid spi-&yer end means for seperating the fine, evaporated, solid porticles ill@ from the other' material sssocieted therewith.

21. An apparetus for recovering solide `dispersed in liquids comprsing e heating chamher, e spreyer within seid shembet, e

liquid circulator communiceting with seid spreyer end the lower ber, e bnrner within seid; chsmher in close proximity to seid spreyer, means for de livering air to seid spi-&yer and means for' seporeting the fine, eveporeted solid perert of seid cham ticles from the other material essocieted therewith., I

22. An appamh for Eecovering solids dispersedjn l'quids comprising s, heating chamber, a, spmy erwithin said chamber, a liquid crculator co mmunicating with Saidi 5 spmyer and the lower part of said charm ber a bumer within Saidi chamber below said( spmyer, means for deliverimg ai? to said s m er means for remng the sup 191137 0% m t sal ?numer am means for 

